Airplane lift dolly



Jan. 29, 1946.

C. PQBAUM AIRPLANE LIFT DOLLY Original Filed June 1, 1945 H'WGMOFGlaophus Phiiemon Bgum Fig.3

Patented Jan. 29, 1946 .AIRPLANELIFT DOLLY Gleophas Philemon Baum,Washington, D. 0.

Original application June 1, 1943, Serial No.

489,267. Divided and this application July 29, 1944, Serial No. 547,240

2 Claims. (01. 280-46) (Granted under the act of amended April 30, 1928;

The subject of this invention is the construction of a suitable spottingdolly for use on aircraft carriers and in close quarters on landingfields and in hangars, for moving airplanes around, and into and out ofcompact parking arrangements. Some of the essential requirements of suchdolly are that it may be operated by one man, that it will lift anairplane wheel substan-.

tially vertically without aiTecting the airplane otherwise, that it willbe movable in any horizontal direction, and that it will be quicklyreleasable without causing lateral or longitudinal movement of theairplane.

The object of the subject device is to provide a dolly that will meetthe above requirements and will be simple and compact in constructionyet suliiciently rugged to withstand rough handling.

A further object is to construct a dolly which is adapted to embrace andquickly raise one wheel, but will engage only the tire and will notcontact any other part of the airplane, such as the hub, axle, etc, andwill not require any special fittings added to the airplane for liftingpurposes.

A further object is to build a dolly so that it may be applied from theoutboard side of either of the two conventional non-swivelling mainwheels of an airplane without endangering the operator by a movingpropeller or obliging him to crawl under the lower wing of aconventional biplane.

Further and more specific objects will become apparent as thedescription of the subject devices proceeds. Several illustrative formsof these devices are shown in the parent application of which this isadivision, one of the forms being shown in the accompanying drawing inwhich,

Fig. 1 is a plan view of one specific form of this device,

Fig. 2 is an end view thereof, and

Fig. 3 is an elevation of this form.

The same numerals are used to designate corresponding parts in the threeviews of the drawing.

The device herein disclosed is one specific form of the devicesdisclosed in the parent application Ser. No. 489,267 filed June 1, 1943,Patent No. 2,362,981, issued November 21, 1944, of which this is adivision. It has means for applying a pair of shoes to the underside ofa tire on an airplane, one shoe in front of the point of tire contactwith the ground and the other in back of it, then lifting the tire oifthe ground by moving one or both shoes.

In this form of my device the shoes 58 and 5! are pivotally mounted onswingable arms and 35 respectively, which are hung on a common March 3,1883, as 370 0. G. 757) Divot 31 mounted in a bracket 48 hung from a bar38 which forms a 0 member with the arms 39. This 0 member is hinged atits ends to pivots 4| and 42 on bracket 40 on a lever arrangement 43.This lever arrangement consists of a long lever arm 44 extending fromthese pivots in a V shape to form a common handle. Upright portions 45are joined to the hinge ends of this arm at right angles thereto and arebraced by angular braces 46 to the sides of the V. At the lower ends ofthe upright portions 45 are mounted casters 52 and 53 swivelled to turnin any direction, similar to those used in the other forms of thedevice. Another upright member 41 somewhat shorter than the other two ismounted at right angles on this arm near the apex of the V and is alsoequipped with a swivelled caster 54 at its end. A brace 49 is providednear the open end of the V for greater strength. Thus in using this formof device it may be rolled into position with the shoes under the tireand the lever arm 44 lifted. Then by pulling the lever down the shoeswill grip the tire and lift it until the arm reaches a horizontalposition whereafter it will be slightly 1owered until the caster on theshort upright member 46 reaches the ground. The mechanism is stabilizedin this position because the casters on the long upright members willhave reached a position on the opposite side of the vertical planepassed through the pivots 4| and 42 thus providing a moment at thesepivots about the lateral casters in the direction of the third casterdue to the weight of the wheel etc. acting on the pivots.

In the construction of these devices the leverage system should be sodesigned that the maximum allowable effort applied at the end of thelever shall be not over 100 pounds.

It is obvious that various modifications in form, dimensions andarrangement may be made without departing from the scope of thisinvention as defined by the appended claims.

This invention may be used by or for the Gov- .ernment of the UnitedStates of America for governmental purposes without the payment of anyroyalties thereon or therefor.

What is claimed is:

1. A lever arm having a V-shaped end; the sides of the V being bracedacross near their extremities, said lever arm having portions at rightangles to the plane of the V at its extremities braced for rigidity tothe corresponding sides of the V and having swivelled casters at theirends, a prop parallel to said portions provided with a swivelled casterat its end and connected to the lever arm near the apex of the V, and a0 formed cradle hinged at the said extremities and having a common pivotat the middle of the cradle for a pair of arms swingable at right anglesto the plane of the C, a shoe being pivotally mounted at the end of eachof these arms in hoelike fashion and adapted to be moved under a wheelwhen the lever arm is raised, and then to lift said wheel when the leverarm is pulled down, said swingable arms being no longer than the radiusof said wheel.

2. A dolly for lifting wheels comprising a lever split into two arms atone end to straddle a wheel, an upright portion rigidly connected to theend of each arm and having a swivelled caster at the bottom, a 0 memberfor straddling the wheel hinged at its ends to the ends of said arms, apair of links having shoes hinged to their lower ends in hoe-likefashion to fit under the periphery of the wheel pivotally fastened tothe middle portion of the 0 member to swing at right angles to the 10plane of the C.

CLEOPHAS PHIIIEMON BAUM.

